Dagger stop



Dec. 25, 1945. MAURER 2,391,726

DAGGER STOP Filed June 19, 1944 INVENTOR.

BY ALBE/W'MAUHER Patented Dec. 25, 1945 2,391,726 DAGGER STOP Albert Maurer, Ashton, R. 1., assignor to Draper Corporation, Hopedale, Mass, a corporation of Maine Application June 19, 1944,-Serial No. 540,983 (o1. 1se1ss) 4 Claims.

The present invention relates generally to protector mechanisms for automatic looms'and, as illustrated herein, relates more particularly to an improved stop for such mechanism.

The protector mechanism for high speed automatic looms is moved rapidly from protecting position and, since this mechanism has substantial mass, it is difficult to stop suddenly without danger of overthrowing. This is essentially true when a rigid stop is used. To overcome this difficulty the stop, which is usually formed of cast iron and bolted to the lay, is provided with a layer of leather against which the dagger stops. This expedient has been generally satisfactory but after continued use the leather is compacted and hence does not provide a resilient surface or member against which the dagger is stopped. Stopping the protector mechanism against a rigid or substantially rigid stop may result in rebound of the parts so that boxing or the shuttle is not properly controlled.

One object of the'present invention is to provide an improved stop for the protector mechanism whereby the above mentioned diffiClJltiBS will be overcome. To this end and in accordance with one feature of the invention, a resilient stop member is provided and against which the dagger is stopped. As illustrated, a rigid member, having a groove or recess in itslower edge, is provided with a resilient member and which is held in position by a strap secured to the rigid member. The resilient member is preferably formed of rubber or other synthetic rubberlike material.

Another object of the present invention is to improve generally upon the construction and operation of looms.

With the above and other objects and features in view, the invention will now be described with particular reference to the accompanying draw ing and in which:

Fig. 1 is a view, partly in section, showing a portion of a loom to which the present invention is applied, with the parts in extreme forward position;

Fig. 2 is a view similar to Fig. 1 but showing the parts in extreme rearward position; and

Fig. 3 is a detail view of a preferred form of stop member.

In the drawing, only a portion of the loom is shown. The parts not shown are of conventional construction and form no part of the present invention.

The usual protector mechanism of an automatic loom comprises a protector rod having fixed thereto at each end a dagger l2. The protector rod 10 is normally supported on the under side of a lay I4 in bearings it. The protector rod [0 has a rearwardly bent end "forming a dagger finger stud it to which a dagger finger 2!! is secured by suitable set screws 22-. v The upper end of the dagger finger 20 is provided with a threaded opening for receiving a bolt 24 which bears against the inner end portion of a binder 26 which is pivoted at its outer end to the lay end 28. The lay end 28 forms the bottom wall of the shuttle box and the binder 26 and a front box plate 34) form rear and front walls of the shuttle box between which a shuttle 32 is received. When the shuttle 32 enters the shuttle box, it engages the usual swell on the binder 26 and causes the binder 26 to swing rearwardly into the position shown in Fig. 1. The shuttle enters the shuttle box as the lay i4 is moving forwardl and at about the mid point of the forward movement. Thus, the dagger I2 is lifted above the frog steel 34 and the stop mechanism is not operated to stop the loom.

The shuttle enters the shuttle box at a relatively high rate of speed and the binder 2B is swung at a high rate of speed which in turn is transmitted to the dagger finger 20 and the dagger 12. These parts are relatively heavy and it is diflicult to stop the parts. As illustrated, a dagger stop 36 is provided and includes a member 38 fixed to the lay I4 by a bolt 40. The lower end portion of the member 38 is provided with a groove 42 arranged to receive a tubular resilient member 44. The member 44 is preferably formed of rubber but may be formed of other synthetic rubberlike materials. The wall of the tubular member 44 is thick and solid and does not deform or yield except under relatively large pressures. Thus, the dagger I2 is stopped by engagement with a yielding member which stops the dagger 12 without a sudden jar. The member 44 is maintained in position by a strap 46 formed of leather or other suitable flexible material and which is held in position on the member 38 by a rivet 48.

The resilient stop member 44 permits limited movement of the dagger l2 after the dagger has engaged the stop member. The member 44' is placed under progressively greater pressure until movement of the dagger I2 is stopped. This relativel gradual stopping (as compared with stopping against a rigid stop) causes the dagger finger 20 to remain in engagement with the binder 25 and to apply increasing pressure to the shuttle 32 as it is boxed. Thus, rebound of the shuttle is eifectively prevented. Furthermore, since the dagger I2 is brought to a stop against a resilient stop, excessive wear on the protector rod and protector rod bearings is prevented.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a, loom, a reciprocating lay, a protector rod having a laterally projecting dagger thereon, a, dagger finger on said protector rod, a shuttle box on said lay, a pivoted binder in said shuttle box arranged to be engaged by said dagger finger and to swing said dagger out of protecting position when a shuttle enters the shuttle box, a stop member fixed to the lay, a resilient tubular member fixed in a groove'in the lower end portion of said stop member, and a flexible member fixed to said stop member and extending about said resilient tubular member for maintaining said tubular member in position.

2. In a loom, a reciprocating lay,. a protector rod having a laterally projecting dagger thereon, a dagger finger on said protector rod, a shuttle box on said lay, a pivoted binder in said shuttle box arranged to be engaged by said dagger finger and to swing said dagger out of protecting position when a shuttle enters the shuttle box, a rigid member for limiting movement of said dagger out of protecting position, a thick walled resilient tubular member mounted in a groove in said rigid member between the latter and said dagger and arranged to be compressed by said dagger when the dagger moves out of protecting position, and a flexible strap secured to said rigid member for maintaining the resilient member in position.

3. A dagger stop for looms comprising a rigid member having a groove extending transversely across one end thereof, a resilient member extending transversely of said rigid member in said groove and arranged to be compressed by a dagger for limiting movement of said dagger, and means for securing said resilient member in said groove.

4. A dagger stop for looms comprising a rigid member having a groove in its lower end portion, a tubular resilient member fixed in said groove and arranged to be compressed by a dagger for limiting movement thereof, and a flexible strap for securing said resilient member in position.

ALBERT MAURER. 

